The conception of the invasion was admirable, and the execution of the campaign was vigorous, and, under all the circumstances, skilful, but if the Army of the Ohio had been rapidly moved and boldly fought, together with its numerous auxiliaries, both Bragg and Kirby Smith's armies would have been separately beaten and destroyed. Buell's army pursued the enemy from Kentucky, and finally concentrated in front of Nashville. By direction of the President, October 24, 1862, the State of Tennessee east of the Tennessee River and Northern Alabama and Georgia became the Department of the Cumberland, and General W. S. Rosecrans was assigned to its command, his troops to constitute the Fourteenth Army Corps.(36) Buell was, at the same date, ordered to turn over his command to Rosecrans. The latter relived Buell at Louisville October 30th. Buell retired to Indianapolis to await orders. He was never again assigned to active duty, though he held his Major-General's commission until May 23, 1864. He was not without talent, and possessed much technical military learning; was a good organizer and disciplinarian, but was better qualified for an adjutant's office than a command in the field. Many things said of him were untrue or unjust, yet the fact remains that he failed as an independent commander of an army during field operations. With great opportunities, he did not achieve _success_--the only test of greatness in war--possibly in any situation in life. He was not, however, the least of a class developed and brought to the front by the exigencies of war, who were not equal to the work assigned them, or who could not or did not avail themselves of the opportunities presented. Rosecrans, while in command of the Army of the Cumberland, won the battle of Stone's River (December 31, 1862); then pushed Bragg across the Tennessee and fought the great battle of Chickamauga, September 19 and 20, 1863. He was relieved at Chattanooga by Thomas, October 19, 1863, and was assigned to the Department of Missouri, January 28, 1864. In this new field Rosecrans displayed much activity and performed good service, but he was relieved again, December 9, 1864, and thereafter was on waiting orders at Cincinnati. Notwithstanding some mistakes, his character as a great soldier and commanding general will stand the severe scrutiny of military critics. He was a man of many attainments, a fine conversationalist, and a genial gentleman who drew to him many devoted friends. This chapter, already of greater length than was originally designed, must here end, as I must turn to other campaigns, armies, and fields of battle more nearly connected with my further career in the War of the Rebellion. ( 1) _War Records_, vol. xvi., Part I., pp. 838-841. ( 2) _Ibid_., Part II., p. 290. ( 3) _War Records_, vol. x., Part I., p. 910. ( 4) _Ibid_., vol. xvi., Part II., p. 404.